here's the exact error:
calibre, version 0.8.26
ERROR: Recipe Disabled: <p> hbr.org has started requiring the use of javascript to log into their website. This is unsupported in calibre, so this recipe has been disabled. If you would like to see HBR supported in calibre, contact hbr.org and ask them to provide a javascript free login method.
</p>
Calibre 0.8.26